Enhancements - stop command

- Implemented stop command
- Fixed bug in TDB that failed to truncate the pending file on
  update.

src/Context.cpp

@@ -192,9 +192,7 @@ std::string Context::dispatch ()
   else if (cmd.command == "undelete")          { out = handleUndelete        (); }
 */
   else if (cmd.command == "start")             { out = handleStart           (); }
-/*
   else if (cmd.command == "stop")              { out = handleStop            (); }
-*/
   else if (cmd.command == "export")            { out = handleExport          (); }
 /*
   else if (cmd.command == "import")            { out = handleImport          (); }